Sub-process irradiation of naturally contaminated hypodermic needles
1988
Abstract The proportion of nonsterile hypodermic needles within a population of needles ( P ), contaminated initially with native microflora, has been measured as a function of gamma-radiation dose ( D ) over the range 0 – 4 kGy. The relationship between P and D was regular and allowed extrapolation to higher doses corresponding to the generally accepted probability of occurence of a nonsterile item or sterility assurance level (SAL), and beyond. An absorbed dose of 7.5 kGy was estimated to be sufficient to give a value of P of 10 -6 , whereas a dose of 25 kGy would be expected to give a P of 10 -18 .
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